Section I. INTRODUCTION
This section provides a general explanation of all maintenance and repair functions authorized at various
The Maintenance Allocation Chart (MAC) in section II designates overall authority and responsibility of the
performance of maintenance functions on the identified end item or component. The application of the
maintenance functions to the end item or component will be consistent with the capacities and capabilities of the
designated maintenance categories.
Section III lists the tools and test equipment (both special tools and common tools sets) required for each
maintenance function as referenced from section II.
B-2. MAINTENANCE FUNCTIONS.
Maintenance functions will be limited to and defined as follows.
Inspect. To determine the serviceability of an item by comparing its physical, mechanical, and/or electrical
characteristics with established standards through examination (e.g., by sight, sound or feel).
Test. To verify serviceability and to detect incipient failure by measuring the mechanical or electrical
characteristics of an item and comparing those characteristics with prescribed standards.
Service. Operations required periodically to keep an item in proper operating condition, i.e., to clean
(decontaminate), to preserve, to drain, to paint, or to replenish fuel, lubricants, hydraulic fluids, or compressed air
Adjust. To maintain, or regulate, within prescribed limits, by bringing into proper or exact position, or by setting
the operating characteristics to the specified parameters.
Aline. To adjust specified variable elements of an item to bring about an optimum or desired performances.
Calibrate. To compare an instrument (measurement standard or item of test, measurement and diagnostic
equipment) of unverified accuracy with an instrument of known and greater accuracy to detect and correct any
discrepancy in the accuracy of the unverified instrument.
Remove/Install. To remove and install the same item when required to perform service or other maintenance
functions. Install may be the act of replacing, setting, or fixing into position a spare, repair part, or module
(component or assembly) in a manner to allow the proper functioning of the equipment or system.
Replace. To remove an unserviceable item and install a serviceable counterpart in its place. "Replace" is
authorized by the MAC as shown in the 3rd position code of the SMR code.
Repair. The application of maintenance services (inspect, test, service, adjust, aline, calibrate, replace),
including fault location/troubleshooting (the process of investigating and detecting the cause of equipment
malfunctioning, the act of isolating a fault within a system or unit under test (UUT), and disassembly/assembly
(encompasses the step-by-step taking apart (or breakdown of a spare/functional